Electrically-driven pumping system and driving method thereof

1. An electrically-driven pumping system, comprising: a power generation device; at least one energy storage system, comprising an energy storage unit and a bidirectional converter, comprising a first end, a second end, and a third end; a main motor; a pumping device, mechanically connected to the main motor and configured to pump fluid by using a mechanical power output by the main motor; an auxiliary device; and a first transformer, comprising an input end, a first output end, and a second output end, wherein, the power generation device is electrically connected to the energy storage unit, the input end of the first transformer is electrically connected to the energy storage unit, the first output end of the first transformer is electrically connected to the main motor, and the second output end of the first transformer is electrically connected to the auxiliary device, wherein, the first end of the bidirectional converter is electrically connected to the power generation device, the second end of the bidirectional converter is electrically connected to the energy storage unit, and the third end of the bidirectional converter is electrically connected to the input end of the first transformer, wherein, the bidirectional converter is configured to convert an alternating current input from the first end into a direct current and output the direct current through the second end, and convert a direct current input from the second end into an alternating current and output the alternating current through the third end.

2. The electrically-driven pumping system according to claim 1, further comprising: a first inverter, one end of the first inverter being electrically connected to the first output end of the first transformer, and another end of the first inverter being electrically connected to the main motor, wherein, the first inverter is configured to convert a direct current output from the first output end of the first transformer into an alternating current, the power generation device comprises a prime mover and a direct current generator, and the prime mover is mechanically connected to the direct current generator and configured to drive the direct current generator to generate a direct current.

3. The electrically-driven pumping system according to claim 2, further comprising: a second transformer, comprising an input end and an output end; a control system; and a sensor, wherein, the input end of the second transformer is electrically connected to the energy storage unit, and the output end of the second transformer is electrically connected to the control system and the sensor.

4. The electrically-driven pumping system according to claim 2, further comprising: a second inverter, comprising an input end and an output end, wherein, input end of the second inverter is electrically connected to the second output end of the first transformer, and the output end of the second inverter is electrically connected to the auxiliary device.

5. The electrically-driven pumping system according to claim 1, wherein, the power generation device comprises a prime mover and an alternating current generator, the prime mover is mechanically connected to the alternating current generator and configured to drive the alternating current generator to generate an alternating current.

6. The electrically-driven pumping system according to claim 4, further comprising: a control system; a sensor; and a third inverter, one end of the third inverter being electrically connected to the second output end of the first transformer, and another end of the third inverter being electrically connected to the control system and the sensor, wherein, the third inverter is configured to convert an alternating current output from the first output end of the first transformer into a direct current.

7. The electrically-driven pumping system according to claim 5, further comprising: a first frequency converter, one end of the first frequency converter being electrically connected to the first output end of the first transformer, and another end of the first frequency converter being electrically connected to the main motor.

8. The electrically-driven pumping system according to claim 2, wherein, the prime mover comprises at least one of an internal combustion engine and a turbine engine.

9. The electrically-driven pumping system according to claim 1, wherein, the auxiliary device comprises: a first auxiliary motor; and a first auxiliary component, wherein, the second output end of the first transformer is electrically connected to the first auxiliary motor, the first auxiliary motor is mechanically connected to the first auxiliary component and configured to drive the first auxiliary component.

10. The electrically-driven pumping system according to claim 9, wherein, the first auxiliary component comprises at least one selected from a lubrication pump, a heat dissipation pump, a hydraulic pump, a liquid supply pump, a centrifugal pump, a gear pump, an agitator, and a rotor pump.

11. The electrically-driven pumping system according to claim 1, wherein, the auxiliary device further comprises: a second frequency converter; a second auxiliary motor; and a second auxiliary component, wherein, one end of the second frequency converter is electrically connected to the second output end of the first transformer, another end of the second frequency converter is electrically connected to the second auxiliary motor, and the second auxiliary motor is mechanically connected to the second auxiliary component and configured to drive the second auxiliary component.

12. The electrically-driven pumping system according to claim 11, wherein, the second auxiliary component comprises at least one selected from a lubrication pump, a heat dissipation pump, a hydraulic pump, a liquid supply pump, a centrifugal pump, a gear pump, an agitator, and a rotor pump.

13. The electrically-driven pumping system according to claim 1, wherein, the energy storage unit comprises at least one of a chemical cell and a capacitor.

14. The electrically-driven pumping system according to claim 1, wherein, the at least one energy storage system comprises a plurality of energy storage systems, and the plurality of energy storage systems are electrically connected in parallel between the power generation device and the first transformer.

15. The electrically-driven pumping system according to claim 1, further comprising: a diverter switch, comprising an input end, a first output end, and a second output end, wherein, the input end of the diverter switch is electrically connected to the power generation device, the first output end of the diverter switch is electrically connected to the energy storage system, and the second output end of the diverter switch is electrically connected to the first transformer.

16. The electrically-driven pumping system according to claim 3, wherein, the energy storage system further comprises: a power management system, electrically connected to the energy storage unit, and configured to monitor a state of the energy storage unit and manage the energy storage unit.

17. The electrically-driven pumping system according to claim 16, further comprising: a remote controller, wherein, the power generation device comprises a power generation device controller, the control system is in communication with the power generation device controller, a sensor, and the power management system, respectively, and the remote controller is in communication with the control system.

18. A method of driving the electrically-driven pumping system according to claim 1, comprising: controlling the power generation device to be in a state of highly-efficient operation; and adjusting a start and stop state of the power generation device and a charge and discharge state of the at least one energy storage system according to a total power consumption of the main motor and the auxiliary device.

19. The method of driving of the electrically-driven pumping system according to claim 18, wherein, adjusting the charge and discharge state of the at least one energy storage system according to the total power consumption of the main motor and the auxiliary device comprises: when the total power consumption of the main motor and the auxiliary device is greater than a power of power supply of the at least one energy storage system, controlling the power generation device and the at least one energy storage system to simultaneously supply power to the main motor and the auxiliary device; when the total power consumption of the main motor and the auxiliary device is less than the power of power supply of the at least one energy storage system, and an electric quantity of the at least one energy storage system is greater than a preset proportion of a power capacity of the at least one energy storage system, controlling the at least one energy storage system to discharge and turning off the power generation device; and when the total power consumption of the main motor and the auxiliary device is less than the power of power supply of the at least one energy storage system, and an electric quantity of the at least one energy storage system is less than the preset proportion of the power capacity of the at least one energy storage system, controlling the at least one energy storage system to discharge, and starting the power generation device to charge the at least one energy storage system.

20. The method of driving of the electrically-driven pumping system according to claim 19, wherein, the preset proportion is 20%.